If you've read our review of the new iMac, you already know that a majority of what's really new about Apple's latest all-in-one is its accessories. The destructive folks over at iFixit say that the 21.5-inch model has what "looks like" an LG ultra-HD display and a Texas Instruments chip, while the fan and HDD are the same -- the speakers are too. The logic board is where the surprises come in, and they might not make you too happy. Configure a machine without flash storage or a Fusion Drive? You won't be able to add one at a later date because those don't include an onboard connector to do so.