I'm still wondering about the Tatsuno. I attempted to read the explanation on the web site but I didn't get the whole thing, probably because some of the foreign terms.
I would think it would be like 達人 (master) but hopefully not like 絶つ, which is discontinued.
The 25mm is in the standard class so I hope that they will provide a better version in the high grade at 2.0 or even 2.2. Anything between the very expensive Leica/Panasonic and this new one would be great. Compact lenses are great, as long as you have a use for them.