garageCube

[nikon]

Try qLab. It may be exactly what you are looking for. The bonus is you do not need to purchase it - you can rent a license daily basis.

wow ive totaly forgot about this product looks like it can do the job what i need will test it for some time renting licence is a nice option but full package for 600$ isnt that much

[The Midi Thief]

Yes, haven't got myself one yet, but that would definitely be a good option. Do you know any app names?

This post mentions a few. A lot of other valuable info on that site:
http://iosmidi.com/midi-app-roundup/

I have to look in to this stuff. You can connect your iPad straight to a MIDI device with at USB cable if you have the Camera Connection Kit. That site talks more about it. I'm not sure how useful that is for us however. I'm not 100% sure that these apps can send the midi live over wifi. I will look in to this more over christmas.