Apple's iLife suite of applications is getting long in the tooth, and a refresh is on the way. It would be nice to see the updated suite of applications released while 2010 is still relatively young. iLife 09 was introduced in January of 2009. It's mid-March now and no word of a release date as of yet. The iPad has taken center stage on Apple's priorities for now.
If I were to guess what the updates would be, I suppose that there would be even greater integration with online social networking services like Facebook, Twitter, YouTube and possibly Vimeo.
I don't expect iDVD to be enhanced much more. It seems that Apple is moving away from DVDs in general as sharing of content by home users with online services has become much more prevalent over the past several years.
Don't expect major upgrades, just better integration with social life online.
Erik