you can have a look at latest intervention (21st november at Tokyo), more particularly the net-distribution :
http://fsfeurope.org/projects/gplv3/tokyo-rms-transcript#net-distributionthe summary of this conference gives a fast overview of changes :
3. Internationalisation
4. Licence compatibility
5. Preventing tivoisation
6. Tivoisation and Treacherous Computing
7. General comments on Treacherous Computing
8. Software patents
9. The Novell and Microsoft example
10. Internet distribution instead of mail order
11. Licence termination
12. Narrow patent retaliation
13. Undermining the DMCA and EUCD
It seems to me that tivoisation is important even for OpenArena : what would you think of a game-console including OpenArena but only working with a major vendor's servers ? (and this vendor refusing to provide the required parameters of config' files (keys...) and new maps added (only working with their servers...). As the server-software would be only on their physical servers they would argue that it's not a "distribution", hence GPL2 does not apply... only the client part would be available freely (as obviously distributed).
Well, my example is hypothetical, of course.
As far as OpenArena is concerned, changing to GPLv3 is "simply" a matter of "is a fork to GPL3+ possible ?" :
- either all work is under GPL2+ and this is possible, a good practice is to warn all copyright owners, then change licensing
- either contact _all_ copyright owners (who have licensed with strict GPL2) and get them to acknowledge the new licensing (hard task as some contributors can no longer be contacted or may not agree, well then : wait 50 or 70 or 90 years after their death - depending if Canadian law or Berne or Disney amendment - till it becomes public domain, which may not give the source code :/)
IANAL and my interpretation may be false too :/ do refer to
http://gplv3.fsf.org/ which is the official reference for GPLv3 discussions of the draft in progress.