I agree. I just updated to the newest version of Evernote, made a quick change on my PC and wanted to check it on my phone. Nope. Searched everywhere for the sync button and it is magically gone. I'm like, "What the hell?"
Evernote, if you are going to make a change this fundamental, you could avoid a TON of frustration by just using a pop-up bubble tour of the new version. And yes, you DO need a sync button. Please, please bring it back ASAP.