We have seen an alpha release of Android 4.0 Ice Cream Sandwich SDK ported to Nexus One a few days ago and now we get to see ICS ported on more devices such as: HTC Thunderbolt and Nexus S.
Freelance developers bring an Ice Cream Sandwich touch to phones that probably wont get an official treatment of the ICS OS, even before its official launch with GALAXY Nexus.
HTC Thunderbolt pre-alpha1 ICS port courtesy of RootzWiki user jdkoreclipse, while the Nexus S 4G custom SDK ROM ported by Beezy is pretty stable (see video below) from Android Central Forums.
Direct link to HTC Thunderbolt pre-alpha1 ICS ROM
Direct link to Nexus S 4G pre-alpha ICS ROM
Nexus S 4G running ICS OS