If only they'd release the original trilogy to DVD ... Last I heard, he has no intention of ever doing so.
The first trilogy is scheduled for release sometime after Ep3 -- Lucas has stated he wants to work on it himself and won't have time until then.
Of course, if you mean the original
trilogy, without Lucas's rewrites and edits -- no. It won't ever appear on DVD, at least not from Lucas. If you have VHS copies of the original movies then keep 'em. If you have the Laserdisc copies, then they're quite valuable indeed (highest quality transfer out there). But Lucas has decided, in his infinite stupidity, that the true original theatrical releases will never be sold again. Screw him, if only for the bastardization of the Han/Greedo bar scene.