Could be a PhoneGap app, although it could easily start as a simple responsive web app that renders nicely on tables and iPads.

Initial Scope:

• Configurable character sheet with
• character name
• class & level
• Background
• Player Name
• Race
• Alignment
• Experience Points
• standard attributes (strength, dexterity, constitution, intelligence, wisdom, charisma)
• armor class
• initiative
• hit points
• hit dice
• death saves
• attacks & spellcasting
• equipment, including independent fields for CP, SP, GP, etc
• features & traits