I've waited until Apple had a major update to replace my aging iPad, so I am definitely excited about preorders.
I'm in exactly the same boat.
I've loved my 64GB iPad 4, but it doesn't feel fluid anymore.
I've even had to rearrange the whole layout, getting rid of folders & spreading my apps across several pages, as I worked out that too many folders creating stuttering.
What iPad are you coming from?
Yeah, I'm really looking forward to the iPad Pro ...