I got some good stuff from my friend Daryl over at AudioCodes the other day. Daryl Hunter is a voice architect over there; he just knows stuff. Good source.
At any rate, the important tidbit for our purposes is that Daryl/AudioCodes thinks that Microsoft has a solid chance of making good on it's 2Q2018 target for IP phones to be used in Microsoft Teams.
Note the "Calling Road Map"
This means that your existing SfB/Lync IP phones can be re-used with Teams. Nice. Hate to buy that stuff more than once.
FYI, here is the two road maps. Note that they conflict to a small degree, but generally say the same thing.