I think at is point people can only guess at what will happen with the new system.
as Steve said above there isnt anyone on here willing to share when Peel shifts to its new system. I plan to bring my scanner to work and let it run all day for a few days on the new system and see if it is active at all.
Right now Peel's system is active, very busy and entertaining. I find that Peel Police are very candid about what they say, you will have a good deal of time to listen to whats going on here.
Even if Peel's new system is totally encrypted you still have EMS, OPP, MTO and MTO enforcement on Fleetnet, you wont be starved for action. You have tons of listening all over the GTA.
As others have mentioned, you can get a good deal of Ebay or like Kirk suggested pm Torontokris. He will offer you a good price, even program or maybe show you how to program.
He let me borrow one of his scanners once and he spent an hour with me teaching me how to use the GRE scanner.
You cant beat his service.