I found such a session in this session preference site of TechEd North America 2011 called:
Parallel Extensions in .NET 4.5
so it looks like there will be an interim release of .NET framework before v5, I guess it may be based on the v4 CLR, adding some more libraries onto it, to give some goodies to developers before the potentially radical leaps of v5, if v5 is really related to the Jupiter thing in any way.
so what could get into such an interim release ?? any speculations ??
on the same session list of TechEd NA, these two titles are interesting too:
Code First Development in Entity Framework 4.1
Entity Framework 4 and Beyond: Building Real-world Applications
In this demo-heavy session, we’ll take a tour around the next version of EF and see several features that have never been seen before. We’ll then talk about our long-term roadmap and the vision behind the Entity Data Model (EDM).
the version number 4.1 of Entity Framework is a little bit weird here, EF 4.1 in .NET 4.5 is confusing, maybe EF 4.1 an out-of-bind release of EF? givin EF CodeFirst or the 'magic horn' is near complete now, maybe this will be released before .NET 4.5 ? that is ... well... weird.
anyway, there are some other stuff we can guess:
maybe the Task-Based Async pattern and the language support of it in C#/VB will get into .NET 4.5, since a new PFX will be there, and its designed to work with this Async stuff. the only problem is, C#/VB languages will get a new version number, C# 5.0 and VB 11.0 according to Bard De Smet, C# 5.0 in .NET 4.5 will be confusing, just like C# 3.0 in .NET 3.5.
Rx is part of the builtin library of WP7, and graduated from the incubation state, maybe it should be shipped with .NET framework too, at least the core of it, but Rx also has its own out-of-bound releases, which is not seen for other parts of .NET, so this is still uncertain.
Xaml2009 missed the train of .NET 4, it should get into the next version, hopefully.
??????? some other stuff we havent seen yet ???? any thoughts ???
PS: another interesting session in that list is :
The Future of C# and Visual Basic
OK we have saw this title before, but, its description is : TBD