Well, the only one I've actually seen is the one that I found the other day at a local WM, and it's the correct "salmon" colored Tills. At this point, I'm more worried about finding a decent Tarkin, as the one I picked up (also the only one I have ever seen) looks like a Harvey Dent doppelganger.
I'm thinking that this "light" colored version is at least a production error and at most a running change due to a production error. To make an intentional variant of a non-army builder that didn't even appear on screen long enough to have anyone other than die-hards say, "That guy looks like Admiral Ackbar!" would be one of the more questionable things that Hasbro has done with their little variant tendencies (which I am thankful beyond belief are done sparingly and appropriately).
That said, Tills makes me wish they would do a new version of Admiral Ackbar sometime in the next few years, preferably with that chair he sat in on the ship in ROTJ.