As reported in March, this year's Gunpla Expo is held in Nagoya Parco's Parco Gallery from the 25th April to 11th May. For those who missed it, you can take a look at the many photos from the event in this previous posting.
Then again, I realize that we get to see very few pictures of the event-limited Gunplas from Gunpla Expo Nagoya. While the images below are from The Gundam Base Side One, I have no idea where to locate them in their website since I don't know Korean. Luckily the fine folks at Toysdaily posted the images in their forum for Gundam fans to see ^^
1/60 Gundam Exia Clear Color Version - 4,500 Yen (exclusive of tax)
MG Strike Freedom Gundam Clear Color Version - 4,800 Yen (exclusive of tax)
MG Zaku II Ver. 2.0 Real Type Color Specs - 4,000 Yen (exclusive of tax)
* The front view is missing ^^;
HGUC Gundam RX-78-2 Clear Color Version - 1,000 Yen (exclusive of tax)
HGUC Char's Zaku II Metallic Version - 2,000 Yen (exclusive of tax)
HG 1/144 Gundam Exia Metallic Version - 2,200 Yen (exclusive of tax)
BB Senshi Sangokuden Ryuubi Gundam Metallic Version - 1,000 Yen (exclusive of tax)
The review on this kit can be found in this previous posting.
1/60 Bandai Gunpla molding machine - 600 Yen (exclusive of tax)
My favorite among them is Exia Metallic Version, but unless Bandai decides to give these Gunplas a chance to be released as regular kits, not many people can own them.
Alternately, you can try looking for them on auction sites in the future ^^
All images from Toysdaily.