Funny now that you mention that it is gonna have a 105mm
smoothmore gun. I thought NATO standard 105mm rounds are all for
rifled guns (M6
rather than smoothbore guns. Even the
French TML 105mm gun is rifled rather than smoothbore. Only the
120mm guns used by NATO are smoothmore. However, I did read from
Janes that the German (Rheinmetall GmbH) has recently developed
smoothbore 105mm gun. I'm not sure if this is the one you are
talking about.
Rumors said that it incoporates a reversed Bionix chassis(engine at
the back). The turret is rumored to be technologically transferred
from GIAT, makers of the AMX-13s and AMX-10s that SAF
have.
Most likely one of the French AMX-10RC turret . Can't think of
any other turret that the French has produced. The AMX-30 turret
will be way too big for a small tank the ST is building.
Personally, I rather ST choose the FMC turret or the M8 AGS turret.
They use proven autoloader technology and can incorporate a
commander's independent thermal TV (CITV) for hunter-killer mode.
That's what I'll call a force multipler.
Like Bionix, the tank will have external mounted add-on armours
with internal steel hull. (said to be comparable to the M2
bradley's armor)
I am not all suprised that the Bionix chassis is being used as
the base of the new tank design. Afterall, it make sense from the
logistic point of view. Same chassis share common share parts,
including the wheels, tracks, suspensions, gears, engine etc. But
darn, I still like the M8 most.
Another thing I wish the SAF would consider is to replace the
Centurions with something better such as Leopard 1A5. SAF will have
no problem in sourcing ex-Nethelands or ex-German tanks and simply
recondition them. the A5 version has got the Leo2 FCS which make
them one of the most accurate tank around regardless when they are
firing while stationary or moving. The Germans sure know how to
built good tanks. I think the Leo1A5 tanks will give the Malaysian
T-84 a run of their money. Since T-84 is theoretically a T-72
modified.
ST-kinetics already have a few surprises in development. Dun be
surprised to see a light-weight AGL marriage to SAR-21 to replace
M203s in the near future (similar to the in-development OICW rifle
by the US army)
mouth zipped 
Well, I think ST-Kinetics (CIS) will have quite a fair bit of
challenge to marry SAR-21 with AGL if your account is correct.
SAR-21 can carry a modified version of M203. Why need to bring in
AGL? The ammo themselves will "kill" the person who is carrying it.
Doesn't make sense. OICW has a 20mm genade launcher instead of the
40mm. Furthermore, they are more like the pump-action shot
gun/grenade launcher, somewhat like the one depicted in the movie
Aliens.