Sandeep, ICS source code isn't available yet and it won't be until the GNex comes out. The SDK is out and all the alpha ICS ROMS that are available right now are hacked together using the SDK, which is NOTHING like a proper full ROM based on the source. A real ROM from source is like a human being, a hacked together SDK ROM is more like Frankenstein's Monster.
The OG Droid will undoubtedly see an ICS ROM. I guess it remains to be seen how well it works. There's actually even Android 2.3.7 Gingerbread ROMS for the G1 still that are supposed to run fairly well, so no reason why Droid won't get at least a stripped down ICS.
As for ICS updates, we're looking at Q1-Q2, but only for high-end devices released during 2011 and possibly Q4 2010. Google already said no ICS for the Nexus One, so if your hardware is similar to the N1 or lower you're probably SOL as far as getting an official update.
The OG Droid will undoubtedly see an ICS ROM. I guess it remains to be seen how well it works. There's actually even Android 2.3.7 Gingerbread ROMS for the G1 still that are supposed to run fairly well, so no reason why Droid won't get at least a stripped down ICS.
As for ICS updates, we're looking at Q1-Q2, but only for high-end devices released during 2011 and possibly Q4 2010. Google already said no ICS for the Nexus One, so if your hardware is similar to the N1 or lower you're probably SOL as far as getting an official update.