It appears that Align is working on something to fill the gap between the 600 and 500 models, more pics inside!
Leave it to Align to never stop or slow down their product releases! Check out these pics from RC Mania of what appears to be a 550 sized Trex being tested. Exact blade size is unknown, but would probably be between 500 and 550mm. You can also see a pic of the 550 canopy lined up with a 700 and 600 canopy to get a feel for the size. Details are few at the moment, but we will be sure to let you know more about this new heli as soon as information is available!!
Source: RC Mania
the same as a trex 500 only stretched
he boys get a life en think different MAKE SOMETING NEW !!