This is going to be the first batch of Macs coming with the OSX Lion preinstalled. There are some new models of MacBook Air and also for the Mac Pro series, according 9to5mac.
Apple is about to launch 4 new models of MacBook Air this week, two of these models in 11-inch and 13-inch and with some configuration upgrades (Intel Speedy Sandy Bridge processor and Thunderbolt I/O). However, it seems that there will not be upgrades on the outside.
The new Mac Pro models are coming with a re-designed outside look and may also come a faster 16 cores model. Obviously, Thunderbolt port will be available. Also, Apple will be debuting a new Mac Pro Server.