Greetings!
Well another change (and delay) for the next version involving ship level progression. Not too much change at the bottom end, but the larger ships now have more levels - which was a big request/wish for many players.
Relevant thread:
http://www.spaceempires.net/home/ftopict-2121.html
Long story short: It doesn't change the min or max size for a ship type, but does give finer graduations of size for the big ships.