I'm eying those Loops and One Shots downloads. I have not done any Loops or One Shots, i guess since i have been busy up to now recording guitar and keys real time, and E-Drums for my drum tracks... Can anyone tell me what the new Loops and One Shots are for - Session drummer? Or...

The Loops are .rx2 files.
SONAR can hande these files natively or you can load them into the included RXP player to mash them as you like.
 
The One shots are .wav files (samples) for use in SONAR, a sampler or indeed Session Drummer 3. Their name gives it away that they are percussion/drum samples ie One Shots