E-474 in product lineup and designation scheme

How much is known of the Embraer 474, to be shown in the movie Flightplan starting in September?

It was commented that in some cabin views, the seating is 2-5-2, while in others, it is 3-4-3. This means cabin width is somewhere in the range of Boeing 777 or 747 (which are respectively 580 and 610 cm).

Now, as for product lineup…

Embraer boasts that their E-jets have no middle seats and no one more than one seat from an aisle. Well, Airbus also advertises that their widebodies have no seats more than one seat from an aisle – an advantage which they do not mention either in their narrowbodies (4-abreast is more restrictive than 6-abreast) or in Airbus 380 (3-4-3. The space should have allowed triple-aisle seating 2-3-3-2, with no seat more than one away from an aisle…).

In the designation scheme, Embraer started at E-12x-s. Then reserving E-13X skipped to E-145 (roughly the number of seats! But not exactly – it is more like 49). Then filled in gaps with E-140 and E-135 – roughly seat number + 100. Reserving E-15X and E-16X, continued with E-170 and E-175. Also E-190 and E-195. E-18X was reserved.
It would be in line with the established practice to give E-2XX designations to craft in roughly 100-200 seat ranges, like 5-abreast or 6-abreast narrowbodies, E-3XX to planes in 200-300 seat ranges, perhaps small widebodies 7 or 8 abreast with two aisles, and E-4XX to planes seating 300+, like the 9-10 abreast twin-aisle cross-section of E-474. There may well be more than 374 seats on E-474: after al, E-195 has up to 118 seats, and at least 106 rather than 95…

So, how much details can be gleaned about Embraer 474?