Bleeding edge testers only.
No guarantees it won't destroy your BlackBerry.
Hong Kong CSL released 18.104.22.1688 for the 8700g. Based on historical precedent, software should be compatible across all 8700 series by using the VENDOR.xml deletition trick.
For the link, see the Hong Kong CSL link in the freshly updated BlackBerry OS 4.x Download FAQ
Other OSes of interest for bleeding edge users:
8700 Apps 22.214.171.1248 from Hong Kong CSL
7130e Apps 126.96.36.199 from Bell Mobility
7290 Apps 188.8.131.526 from Hong Kong CSL
7250 Apps 184.108.40.2068 from Telstra Australia
7230/7280 Apps 220.127.116.11 from Hong Kong CSL
7750 Apps 18.104.22.168 from Sprint