Adobe has confirmed it is working on a Photoshop app, but don’t hold your breath. The iPad 2 is very old and almost certainly too old for the future Photoshop app. I also expect that it will only run on iPads with pencil support. Lightroom CC for iPad already exists, but if it doesn’t run on an iPad 2, then it never will. It would not be very realistic to expect Adobe to work on new software for outdated hardware.