Photoshop Touch available for Android Tabs
Touch is closer to photoshop than lightroom if you use layers selections, curves, levels, blending modes, then Touch should be no problems for the user to work on their photo. You can not even save it as a jpg. Touch is designed to create images not edit photos. CS5 can open the files so you can then resize and save as any type of file. There are some amazing tools in touch that is not in photoshop or any other app llike camera fill. (kind of like fill with content aware)
Touch is not ment to open your Raw files and work with them that is why there is a size limit. It is an app that photographers, designers and digital artist can demostrate ideas and then come back into photoshop to do the real work at their studio on a real computer. People buy apps and with a press of a button turn them into art. Touch is like that but you have total control over what is happening.