It's been a long night... received my Omnisphere yesterday, went through its entire 6 DVD Bataan install march, authorized and haven't slept a wink since. Stayed up all night having a blast. Pound for pound, the best value I've purchased in my 25 years as a bassist (yes, I would sell my Steinberger before I'd let go of Omnisphere).
I checked the updates page and there's no 1.5 patch yet, but Omni TR is now live on iTunes app store:
Omni TR weighs in at a very svelte 2.7 MB.
Spectrasonics left a note on the app page that states the 1.5 patch will be posted by the end of today (2/15/11), US PST.
NB -- My copy of Trilian arrived yesterday as well, but it still sits unopened downstairs, as Omnisphere is demanding my full attention.