You might want to consult http://www.pgmusic.com/bbwin.htm and also view the linked videos to see if there are features that make you want to make the change now.

Then you might want to do some simple math, like how much is the upgrade you have to pay now? The update in December used to be about USD 100 -- if you have the until then newest version. Updates used to have a higher price if you have to update from some earlier releases -- just as it is now: http://www.pgmusic.com/bbwin.packages.htm (Currently your update would be 299 to get the current UltraPlusPAK.)

You also might want to consider the new XTRA styles with the included 49PAK. In the past most of these additional PAKs have been included into the next release. (I didn't check if all the additional RealTracks have made it into the standard package.)

If PGMusic doesn't change the policy, then we all will have a chance to buy the 2017 version in December for a reduced price, especially those who have 2016 installed.

Good luck with your decision.

Desktop; i7-2600k, 8 GB mem., Win 10 Pro, BIAB 2017; RB 2017 - latest build
Laptop: i5-2410M, 4 GB mem, Win 10 Pro, BIAB 2017; RB 2017 - latest build