Having worked at a car dealership and sold Hyundais (along with a lot of other major brands) I can say that the Sonata is ok. It isn't anything super special and the only model worth anything is the 2.0T Sport or better (there is a Limited trim for it that has all the bells and whistles).
That said, I guess we have to wait and see how Android auto does. If it acts like Android then in 6 months to a year it will need a clean install to start running normally again as it will slow down. I hope they got that ironed out.
There is one feature I want to know if it has. I wonder if you can have multiple phones connected doing different things. That is one thing SYNC does pretty well, even though people hate on SYNC (because it is a MS product mainly). My wife has a 2013 Taurus with SYNC and I can have her phone connected to receive calls and texts while mine can be connected to play music. Haven't seen another infotainment (stock, not aftermarket) that does that yet.