An improved UI with more customizable features would be nice (I.E. more keyboard and layout options). It would also be nice if more graphing functionality was added. Overall a handy calculator :)
New built-in "sample" programs (examples) ready to use and customize (edit).
New functions: prime and random numbers.
You can save the user's guide as an external file in your device memory.
Programmable Calculator: Now you can write programs to make advanced and automatic calculations.