Without knowing the magazine specs on the CZ and the OAL on the 17 Win. this is more of just an observation, but it looks to me like the 17 Win. is a quite a bit longer than the 17HMR.
I think it's too long to fit in the magazines designed for the 17 HMR and the 22 mag.
Also the body has a larger diameter which means the case head is also larger. That means the firing pin strike won't be in the correct location for the larger case. It would strike more towards the center instead of the rim. The bolt face and extractors will be screwed up too.
All of that aside, does these existing 17HMR and 22 mag actions have the length to accommodate the longer case? It's more than just sticking a longer magazine under the rifle.
22 LR, 22 Mag, 17HMR and the two on the right are the new 17WSM.
To me at least all of this means the manufacturers are going to make completely new rifles or major adaptions to existing rifles to allow them to fire this round. If there isn't an industry wide acceptance of this cartridge with most manufactures producing a nice varity of rifles for it, it's future will be in doubt. Then you will have to order your ammo thru retailers who also stock 5mm rem mag.
Downeast beat me to it, I typed the post and forgot to hit enter before eating dinner ! LOL