Looking forward to Sony's CT330 and CT770. Will be released this month and if it can keep it under the RM1.5k range, it would be interesting (although honestly they aren't worth more than RM1k to be honest).

ST and CT series are 2 different line-ups. So the the upcoming CT330 and CT770 won't be replacing the ST series.
I doubt Malaysia will get both the 330 and 770 though, most probably the CT330 will only be coming in to replace the very old CT260. I'm hope I'm wrong of course.

I've heard the ST7 before. Didn't like it. It's got a pretty wide soundstage (rivaling the Philips HT9100), but the mids are too recessed for my liking. There's very little grunt, bass doesn't match well to bring out the impact in action movies. It's just dull sounding, neither wanting to be a dark nor bright, the ST7 is sort of like a soundbar with an identity crisis. Sony tried to make it a soundbar which does everything well, but unfortunately while it sounds decent, the price says a different thing.

Also having "7.1" directly from the soundbar is just meaningless. The similarly priced Philips HTL9100 with its detachable speakers and offering only 4.1 sounds so much more immersive with better positional cues.
For RM3k, I truly expected a lot more than this. RM3k is bloody hell a lot to spend on a soundbar and it's made worse when a custom 2.1 setup with an entry-level AVR would just mop the entire floor off the ST7 with no sweat, I see no reason to own one.

Haven't heard the ST3, so can't say anything about that.