Hi Velvin,
For the past several releases there has been a slight change to the methodology for versioning DLP. Rather than assigning a version at the beginning of the project our develpers are giving the project a code name and then once it's going to Beta they assign it a version number based on what actually ended up in that particular release. I won't go into the details of how a version number gets assigned, but the key here is that it's not something we decide until a month or two before it actually releases.
With that in mind, I suspect that the rumors you heard about v12 coming out early this year were actually referencing the project that ended up being v11.5 (released in late January 2012). I had heard similar rumors early in 2011 that the release scheduled for early this year would be v12.0, so you may have gotten wind of those same speculations.
Regarding training, I would recommend looking at what features are in (or projected to be in) each release and base your training decisions around that. For instance, with v11.5 (just released) the primary thing we added was tablet support. If monitoring/blocking on an iPad is of interest to your organization you may want to make sure they get into a training covering 11.5.
There are several minor revisions scheduled through this year which will be patch rollups and enhancements but likely won't contain any major features. The next 'major' release (the one I suspect will actually get the 12.0 moniker) is currently slated to release in the early 2013 timeframe (subject to change, of course).
Hope that helps!