Is there disadvantages to buying my MBP now and getting the free update later instead of buying my MBP when Lion comes out? Will Lion take up more space/be slower than if I were to just buy it with Lion pre-installed, any suggestions?
When Lion is installed, it created a small partition on your hard drive that can be used to perform a fresh install of OS X Lion among other things. You don't need to install Snow Leopard first. A boot disk (or flash drive) can also be created from the Lion installer.