No, I don't know if they have a plan to forcibly upgrade old projects. I wish they would do so, because the new platform is far less terrible.
The project Allura page seems nice, altought I still don't understand why they have one sort of navigation in "code" view and in "non-code" view, that looks completely different. Also, the link "Pastebin" displays a 500 error in "non-code" view (http://sourceforge.net/p/allura/pastebin/?source=navbar) but works in "code" view ( http://sourceforge.net/p/allura/pastebin/ ) - you switch "views" by clicking at "Git", apparently. You switch them back by clicking at "Files" or "Summary".
Why does the Allura project have thousand of badly named branches? (It may be a goal but it looks confusing from outside.)
Now let's look at some other project that's linked at SF front page
http://sourceforge.net/projects/weka/
What's the difference between "Wiki" and "MediaWiki"? Oh, once is inside SF, the other one directs me somewhere else and tells me it isn't working. Was that needed?
...why is the code part empty? Is that a bug?
The News are not very new but that's not an error on SF side, I guess.
Overall, I feel like SF jumped 5 years forward - from a site from 10 years ago to a site from 5 years ago. But I still wouldn't use it for any kind of new project.