Bradl,
My belief is that this is the modern day Super Flip. The Super Flip was the second offset release in the original series and also was blue (I had one). It appears that Hammer is copying the release order as back in the 90s. First the Violet, then the Super Flip (Attack) and next might be the modern 3D-Maxxx? There was also a red Super Hook I believe and maybe that was released before the Maxxx. Not positive though but am positive on the release of the Super Flip.
There was also the black one (I have that one) along with the original 3D Offset (violet). I remember there also being a pearl violet of the 3D Offset as well. Interesting to note that the Red one was recently released overseas, so I doubt we'll see that one over here unless someone brings it over for Black Friday.
The new Purple Solid is going to be like a Raw Hammer with a stronger cover and slot below the Dark Web. I am not sure I necessarily see it as a direct replacement for the GB4 simply because the GBs are low RG, medium diff and the Purple solid is higher RG with a lower diff (core numbers are very close to the Raw series). But it could be a replacement if you just want a different look that is still very useable on a variety of conditions.
Unfortunately my problem is that I can't find a house here to even throw the GB4 on to get a good comparison of it compared to anything I have above it, like my BW 2.0, especially given that I the GB4 drilled pin down to keep my angles straight to go up the boards. Going to the Purple Solid Reactive may give me more versatility (with lane conditions) without requiring the soup to be there just to pull the ball out of the bag, so you called it there.
Packy has now put out a review of the 3D Offset Attack. While I do like how much cleaner it is, I have an overseas Widow that is just as clean, so I'd definitely have overlap with this piece. So this is a pass for me for now, unless I want to punch one up with a larger VAL to keep it from being so sharp at the back end. But it does look good. Video is below.
BL.