I'm not sure how much roller you played before your time away from it, but this will be a big factor in your comback. If you've played a few years before, you will be surprised how fast it all comes back to you! Your endurance on the other hand........well you use different muscles and movments in roller than you do in ice, so be ready for early fatigue.
I hadn't played goal in roller since last spring, (when we won yet another chpmpion ship!

) but I played about a month ago and did great. I really thought I was going to stink the place up, but i did very well despite not playing for almost a year. I still had been playing ice 2-3 times a week though.( while a lot of the movments are different, alot are the same, and your conditioning from ice will somewhat transfer over to roller. )
For about 2 1/2 - 3 years there I was playing both roller and ice.......and I loved it, I was probably in the best condition of my life, and was playing great. ( I am also the oldest on both of my teams......roller and ice *35* )
Keep playing both if you can, and if you love roller as much as I do, you'll have a great time!