The article by The Star is highly misleading. BB and TRX won't be covered by MRT3 as they are already covered in MRT1 and MRT2 respectively.

Please refer to speculated alignment and comments from mkmoey13 from Skyscrapercity forum. This speculative alignment makes a lot of sense.
http://imgur.com/1XdKg8M
Updated.
I think I was preoccupied with some old plan at KL Metropolis where they prepared an alley for MRT. A better alignment (updated) would see mrt circle line on west side, serving MITEC, but too bad for their signature tower.
This way Segambut station can be linked. Segambut KTM can be hard to get to, but it could serve as excellent interchange station.
KL Metropolis masterplan

Also, commenting on why I'd interchange at Kentonment instead of Jln Ipoh, or Sentul West. Jln Ipoh is very built up on both sides. Kentonment is elevated, Jln Ipoh station is on the ground or subterranean, while Sentul West is underground. So unless you want to demolish some high rises, or interchange deeper underground at Jln Ipoh, which is very costly. Sentul West Interchange i think isn't that great, You'd have to align with the ktm line, and in the end serve YTL's interest best, Sentul has like 3 stations in the vicinity already. So best way, i think is to interchange some where else, I pick Kentonment station. There is a slight gap between tall commercials there. Besides, Batu Kentomen KTM station is so nearby, maybe build an extended paid linkway, linking all three stations.
Google Map link

ALso, I had to be careful to avoid the DUKE Sri Damansara extension interchange. Lots of elevated highway ingress/egress there.[B]

for me, they should not cut MRT 3 but just need to realign the station.