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Today I'm using the Magento CE 2.1.5, what'll be improved with this update? and what are the errors that I could have with this update?

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Highlights

Magento 2.1.6 contains over 15 significant performance enhancements when compared to 2.1.5. Look for the following highlights in this release:

Improved performance of the Category page

  • loading configurable products from the database is now up to 5x faster

  • price calculations are now up to 3-5% faster

  • stock validation is now up to 20% faster

Optimized image resizing

  • image resize operations performed from the command line interface now generate images of all sizes. See magento catalog:images:resize for more information.

  • image resize operations from the Admin have been fixed

  • significant decrease in the number of file system operations when processing images on frontend

  • caching of image metadata is up to 50% faster, depending on store size

Improved performance of layered navigation

  • layered navigation is now up to 3% faster due to the caching of attribute options

Minimized indexing operations after product import

You can check more bugfixes and details here: http://devdocs.magento.com/guides/v2.1/release-notes/ReleaseNotes2.1.6CE.html

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Functional fixes and enhancements

We address the following functional fixes and enhancements in this release.

Catalog
  • Magento no longer locks the category_product_entity table. Unlocking this table reduces the potential of lock-related timeouts that can occur when indexing and checkout operations run in parallel. Previously, Magento locked the category_product_entity table.
  • The storefront now displays images that Magento resizes during product save operations, rather than resizing the product on the storefront. Previously, the image path contained store_id, and during save operations, Magento resized images for images the default store only.
  • The \Magento\CatalogInventory\Model\Stock\Status\getStockId() method now returns the correct values.
Configurable products
  • The check that Magento runs to confirm a configurable product’s readiness for sale is now faster. (The isSalable method checks that a configurable product can be sold (that is, is in a saleable state)).
  • Magento no longer calculates configurable product special prices on the category page. Previously, Magento calculated special prices on the category page, but did not display them.
Indexers
  • Magento now runs a selective partial re-indexing operation after import if you enabled Update on Schedule. Previously, Magento ran a full reindex no matter which index mode was set.
Import
  • Magento now displays imported product images in this order: first, the base image, then the additional images in the order in which they were listed in the CSV file. Previously, Magento displayed images in this unexpected order: first, an additional image, then the base image, and finally, all remaining additional images.
Miscellaneous
  • Magento now caches attribute options for the layered navigation feature. This reduces the number of queries to the database, and consequently improves performance.
  • Magento no longer performs unnecessary file check operations (for example, file_exists, is_file), which improves the performance of the category and product pages.
  • Magento now caches image metadata, which avoids the time-consuming need to read images for metadata loading.
  • Magento now shows a significant decrease in Redis traffic after upgrading 2.1.2 to 2.1.4.
Swatches
  • Magento no longer creates redundant objects when initializing a configurable product on the Category page.
  • You can now disable swatches for both the Catalog page and search results (quick or advanced). To disable swatches from these requests, disable Stores > Configuration > Catalog > Storefront > Show Swatches in Product List.
  • The logic that Magento uses to validate swatch attributes has been optimized.
  • Magento now caches swatch data in the block cache, which improves the responsiveness of the configurable product pages.
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You can refer release notes and more information in below link.

http://devdocs.magento.com/guides/v2.1/release-notes/ReleaseNotes2.1.6CE.html

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