It’s been a while since Intel updated its SLC SSD roadmap and the good old X25-E is the only SLC solution based on Intel NAND. It's based on 50nm technology and, in case you didn't know, SLC stands for Single layer cell - faster than MLC (multi layer) but also dramatically more expensive.
Intel plans to introduce a new drive codenamed Ramsdale in 200GB and 400GB size and this new drive is based on new 34nm SLC process. This will be the first Intel’s drive for PCIe buss as the X25-E relies on the quite obsolete SATA 3GB/s.
This drive clearly tops the Lydonville MLC offering that comes in 300GB, 200GB and 100GB and SATA 3Gb/s. We still don’t know any projections of Ramsdale speeds but you can imagine that they will match or overcome the fastest drives you can buy today. Note however that, since they are intended for server market, they won’t come cheap.