Wow, what a week it's been for Apple's future iPen. It began on Tuesday with a surprise granted patent focused on iPen orientation detection followed by three detailed patent applications covering a multitude of features on Thursday. And while we were busy writing those reports we happen to stumble upon two more iPen patent applications that Apple filed in Europe that same day. The main patent filing is a spectacular overview of a modular iPen design that would allow users to choose different modules for different tasks. One feature, for example, would allow a student or business user giving a presentation to use this iPen as an advanced laser pointer. Apple's latest European filing is without a doubt one of the most sophisticated of them all to date. It's intelligently designed so that Apple will be able to introduce new accessory "expansion modules" over time so as to keep the iPen up to date with the latest and greatest features. In fact, Apple's patent application provides us with a number of possible iPen expansion module examples that they already have in mind.