You'll get some of the betas/RC but not all, and you'll have to wait for them...
And you proberbly will get a 120-days Trail when it's final.
Thats what I got with my subscription during the Win2k betas..
My advise to you is, if possible cancel your subscription if you don't need all these CDs at work. And if you do, you boss should pay them for you.
The best thing with Technet+ is the Resource Kit and the KnowledgeBase, not the Betas

Sorry
// Toby