http://innerabove.deviantart.com/gallery/
Specifically
http://innerabove.deviantart.com/art/Post-Apocalyptic-Armor-103390472
http://innerabove.deviantart.com/art/Retro-Power-Armor-Colors-105541118
http://innerabove.deviantart.com/art/Retro-Power-Armor-Lineart-105291550
http://innerabove.deviantart.com/art/Buy-War-Bonds-103390796
http://innerabove.deviantart.com/art/Tools-of-the-Trade-106567045
The artist made claims of being approached by folks at Interplay for this artwork, and while it may not be official for V13 I feel it does perhaps give an insight into the possible artistic direction that game may take.
http://calebcleveland.blogspot.com/ as well.
I especially think his T51c power armor is nifty and definitely less 'high tech' looking than the T51b.