I ran the update last night, but just noticed that "About" in the TP interface still shows 1.9.0. No big deal since I'm not having issues of any kind, but can any one else confirm this? Maybe they forgot to update it.
EDIT: It appears that the standalone TruePianos.exe file has been replaced with a newer one, but the VSTi DLLs have not, which seems odd if there was a problem with the VST in SONAR. I entered a support request on their website to confirm what I should be seeing.