Intel doesn’t rest with SSD expansion and it currently ships a lot of 34nm based SLC and MCL drives.
Currently it sells 510 and 310 series drives, based on 34nm MLC as well as 311 based on 34nm SLC. It even has 25nm MLC based 320 series that go all the way to 600GB capacity.
The future replacement of 500 series is codenamed Cherryville and this one goes all the way up to 480GB. It is based on 25nm MLC and it should get higher speeds than 510 series. The drive once it gets available ships as 2.5 inch disk and it supports SATA 6Gb/s. It comes in 60GB,120GB, 180GB, 240GB and 480GB, but the current price is unknown. These drives should start shipping in Q4 2011.
The next, next generation of 500 series drives is 20nm NAND based and should come in Q2 2012, and it is being developed under King Crest codename.