a bit more information would have been helpful, but after inviestigating the site. It looks like 2 new sporty models. Looks to be nicer interior, sporty exhuast system, big anti roll bars, sport suspension and a front strut brace.
the 12SR has 110PS and 134NM, while the 15ST-A has 109PS and 148NM.
there also seems to be several 4wd versions of the march.