CPU: IBM Power 7 based architecture, with 3 cores underclocked at 2.8 GHz to keep power consumption down.
GPU: Custom 40nm AMD GPU based on R7xx series with 32 MB embedded eDRAM and unified shader architecture (directX 10.1 equivalent and shader 4.0 support)
RAM: 1.5GB of total memory, initially with 1 available for games and 0,5 reserved for an unoptimized OS, more memory can become available as OS is tweaked leaving the final number at around 1.3 for games and 0,2 for OS
Drive: Blu-ray based propietary disc (this one I can confirm!)

My personal opinion is worth a grain a salt; so I'll just post the expectations of "analysts" of what analysts think it needs to be:

8 core CPU at 4.2 GHz per core,
12 GB of Ram
1 TB Harddrive
4 Gamepad compatability (1 packed in)

249 USD$

You probably nailed it right there...

More than PS3, less than PS4

Suppose your guess is correct and the Wii U has no DirectX 11 equivalent, could this get in the way of the system yet again not getting some major 3rd party multiplats?

this is the wiiU-thread, not the ps4-dreamers-thread ;) btw, your specs are missing the gpu...

There are some games this gen that were primarily built for DX11 and DX10.1 and were scalable to DX9 so even to PS360 can support it.

Example: Crysis 2 and 3. 

If the Wii U doesn't get a multiplat by technical limitations, is might be more due to the fact of the processing power not being up to the task of processing massive physics,AI and huge crowded environments that cannot be taken away from the game or toned down, otherwise the whole premise of the game is lost. 

One example: Rome Total War 2. If you scale that game down to fit on PS360 hardware it wouldn't be the same game. Or so some people say. Never played or care about the genre.

No.  The difference between DX 11 equivelant shaders and DX 10.1 equivelant shaders is minor compared to the fact that the Wii had a fixed function TEV system rather than the unified programmable shaders the PS3/X360 had. 

If anything, it will simply prevent the Wii U version from using the same shader but it won't prevent it from actually having a game.

is going to be more powerful than the PS360
enough for me

CPU: 3 core Power7 clocked at 3GHz
RAM: 1Gb and additional 64Mb for OS. Possibly an additional 448Mb for app like services.
GPU: R7xx based with 32Mb EDRAM and with a tessellation unit.
Storage: 8Gb SSD and support for both SD cards and external HDDs... possibly a branded external HDD only with DRM built-in.
Network: Wi-Fi b/g/n, no ethernet support
Drive: Blu-Ray for games only, no video/film support.

Others:
4x USB ports. Probably USB 2.0 but they may have 1 USB 3.0 for external HDDs and for playing games straight off of.
HDMI connection
Support for up to 1080p