Acer have just unveiled the Acer W4 (Acer Iconia W4-820), an 8-inch Windows 8.1 tablet that replaces the outgoing Acer W3 – which was the first 8-inch Windows 8 tablet. It’s possible to order the Acer Iconia W4 here: http://www.amazon.com/Acer-Iconia-W4 (UPDATED: Prices have been cut to $219 since launch) There are three main changes to this small Windows 8.1 tablet. First of all it’s got a more powerful processor, since … more…