Dish hasn't said. I'm betting the Turbo packs are going away. If you sub to Platinum now, you can keep it grandfathered with your current Turbo pack. If you want to add it, I bet they will tell you to sign up for a classic pack and add HD. It actually isn't that raw of deal if you ask me. Say you get turbo bronze, DVR, Locals, and Platinum.
$30 base + $6 DVR + $5 Locals + $10 platinum = $51
Now replace that with classic bronze "with DVR" pack (which I also understand to include locals)
$45 base + $10 "HD+Platinum" = $55. A $4 premium, and you get a few more SD channels. Not bad. Unless I misunderstood something and the $45 pack doesn't include locals, in which case you are looking at a $9 premium, and that isn't so good a deal.