Comment Um, yeah, about that (Score 4, Informative) 111
I guess you may be looking for "fully" open in the mathematical sense, which is generally unachievable.
You can go over to OpenCores right now and download the spiffy OR1200 OpenRisc design and run it on the OpenRISC development board, but that board uses Altera FPGAs. Which themselves aren't open. Opencores.org had a failed kickstarter that they ran themselves (probably should have used Kickstarter), which raised about half the money needed to make a comminity sponsored chip of it.
http://opencores.org/or1k/OR1200_OpenRISC_Processor
Since that was not successful, you're stuck buying someone's processor, for which they'll have some ownership. Once you accept that and realize there are enormous numbers of processors out there (not really a lock in), then the question of open is about your ability to redesign the board and exert complete control of all the peripheral chips.
The A13 will let you do that. At release time the RPi would not, due to some documentation restrictions and video binaries, but they are making progress in this vein.
So if you want fully open, (and I certainly do), we need to convince the OpenCores people to run a kickstarter for the remaining funds needed, and contribute. Until then the A13 is as close as we get.