I saw this announced. I did think it was quite early in the year for Roger to be committing to it, to be honest (sorry Rog
), but maybe that's the plan- it might end up being his 'final'. Which could be quite fitting. I don't think he will play much this year- and you can't blame him for that.
I very much hope we don't see 'you know who' very much this year
. Or Isner. 
I haven't had chance to see much tennis 'live' over the the last few years -and have never seen Rafa live- so am very glad that I at least got to see Stefan in his prime
(though not at Wimbledon- I saw him a few weeks before he won his first Wimbledon title though).