OK, this is what we've got:
* The E8 series Tsubasa & Tomica Arch Railroad Crossing Set with dark blue S-rails that we already know about (see above).
* A
Plarail stamp rally will be held with JR East from April 5th to June 2nd. Collect the stamps from any 10 of the participating 22 stations in the Tokyo metropolitan area and you'll get a rubber keychain and a chance to be among 200 winners of an E235 series Yamanote Line, the same clear version that was on offer last year, but with the addition of 65th anniversary markings.
* Also, collect stamps from the three JR East Shinkansen stations (Fukushima, Karuizawa and Echigo Yuzawa), then make a 600 yen purchase at a station NewDays store and get a free 65th anniversary clear E3 Tsubasa, again with 65th anniversary markings.
*
Plarail Expo in Tokyo will be held at Ikebukuro Sunshine City between 26th April and 5th May. "We plan to sell new Plarail products to commemorate the event". Some of the buttons at the top of the website are labelled 'coming soon', one of them bears the text 'Plarail Market'. The admission souvenir will be this E8 Shinkansen Tsubasa intermediate car: