tsc has the Reese adapter 2 1/2" to 2" for 10$ just picked mine up yesterday works great

 

this kinda sucks, there is alot less options for 2.5 hitches, I was planning on buying a B&W ball mount, I don't see the multi ball mount hitches available in 2.5. I don't see the need to go to a 2.5" hitch, I have a heavy duty ball mount that has a shank made of solid steel it must weigh 20 #'s but if exceeding the weight limits is a problem the solution is a heavier duty ball mount and they are available in 2" no need to go 2.5"

 

I Dunno mine came with a 2" receptacle.

 

Coming from a guy who pulls a skidloader, mini excavator and dump trailers with broken concrete or gravel. I often exceed the 6000lb limit of the 2" system. And I don't want to use a WD system when I'm hookin gup and dropping trailers several times each day. So the 2.5" system is exactly what I want from a HD truck.

Now that both Ford and GM are shipping trucks with these class V hitches, You will quickly see manufactures jump on the market and bring new products to market. Just like the 7pin RV plug has almost totally replaced the old 4 pin trailer wiring plugs, The 2.5 will be what most folks default to.

Here is an example of one mfg already shipping the product.
Adjustable Hitches | TrailerHitchSource.com

 

those are some pretty nifty hitches but even their 2.5 model looks like it just uses an adapter. one thing I would really like to see with these ball mounts is for them to try and make them so they don't stick out past the hitch so far. if you watch the videos on that site it looks like if they just drilled the hole for the cross pin closer to the drop portion that would pull it in a couple inches right there. most hitches I see could probably move ball about 3" closer to the back of the truck. this just means less leverage on the back of the truck.