Toyota is shortly going to build their version of the SMART.
Worldwide, it will be called the iQ. The US version will bear the Scion brand as the Scion iQ.
If the rumors (discussed on the Other Scions section of the forum) prove accurate, in the next couple of years we will have:
Scion tC (an updated version of the tC closer mechanically to the xB and with a new body)
----- Edit: Newer reports . . . the next gen tC will be co-engineered with Subaru and be RWD
Scion iQ (a SMART competitor)
(Those 4 are CONFIRMED)
Scion pickup (presently nicknamed the xP among Scion-fanatics, maybe based on the xB and maybe not)
POSSIBLY, something between the xD and xB that is more like the first gen xB.
If all three new models go through, we will have 6 Scion lines.