From what I understand, Glen Larson is going to produce and may have much more to do with it than just a "creator" title, which is pretty much all he had on the Syfy TV series. It doesn't sound like it's going to have anything to do with the Syfy series, but more of a continuation or reboot of the original series.
In other words, except for the last of humanity fleeing from the Cylons, it may not have much in common with the TV series.
I don't remembr all the details off hand, but I remember their being a big stink from not only Larson but also Richard Hatch before the TV series started. They were mad there wasn't more in common with the original series, there was heat because Starbuck was now a woman, etc. I know fans were upset at some of that too, but after the series got rolling, and truned out so well, I don't know how those hardcore 70's series fans feel about it.
Honestly, I loved that series so much, thought that it covered so many relevant topics so well, that there's a very good chance that I'd never bother to see a big screen film. I'd much rather see them pull together the Syfy cast and do a movie that helps tie the eventual end of Caprica more in line with the mini and series. A prequel, possibly.
Edit> Acutally, I just looked up Glen Larson. Maybe he he did have more of a role than just creator on the BSG series on Syfy. It looks like IMDB lists him as "Writer (creator: Battlestar Galactica), consulting producer"
Not sure what that all means exactly, but I do recall there being some difference of opion on things when the series started. I'm thinking those credits are more of a requirement (writer/creator) and honorary (consulting producer) than anything else.