This news is from HTC Taiwan Website.
They said HTC Sense will be free for every G2 user. and the update will be released before 30 October.
And another news is for other counties' G2 user, HTC Sense will be released at November 2009, different countries have different time.
original words from HTC Website:
"HTC Magic users can soon experience HTC Sense on their Magic when a free upgrade is made available in November 2009. With the upgrade to HTC Sense, users will enjoy a more holistic mobile experience made available by HTC. Be sure to sign up as a HTC e-Club member to stay informed of the availability of the upgrade and be the one of the first to experience the new Sense."
In a word, HTC Sense is coming!!!