Ok, here is how I will attempt to explain this...
The current 1 series has been out as a Hatch for sometime now. Yes, the coupe is different in many ways. Now, look at the 3er's history. The new generation sedan is released a year before the new generation coupe/vert. So what you see in this list is an all new 1 series sedan being release a year before the all new coupe...
As for size, uh, whomever said they hardly fit in a 1er must not fit into an e46 easy either. I fit into my e46 sedan (shorter doors than a coupe) just fine at 5'11" 160lbs. The 1er has a higher roofline, but basically the same exterior dimensions as an e46 coupe. As most BMW's grow with every generation, it is possible the next generation 1er will be larger than the current. I, personally, hope its not, but I don't have any issues fitting into a 1er, e46, e36, e30, etc, etc...
-- 2015 i01 (i3) BEV, Laurel Grey all options -20" wheels.
-- 2015 i01 (i3) with REx, Laurel Grey, all options, 24 month test drive.
-- 2003 330i ZHP, Imola Red Build Date 03/03/03 SOLD! Owned for nearly 9 years.