The company states that users with personal and "small accounts" shouldn't necessarily notice a big improvement in their overall experience with Evernote. However, users with vast amount of data in their accounts, users that sync notes between numerous devices, and Evernote Business users should definitely notice the "massive improvement" in the overall sync speed of the service. The update applies to all versions of the Evernote app.
Speaking of apps, Evernote states that it is about to update all of its apps, APIs, and developer guidelines soon, so that they can benefit from the new capabilities of the sync servers. According to the company, "this will make sync even faster".
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source: Evernote via Engadget