Contracts 905 to 909 were previously referred to as the contracts for the MRT Downtown Extension. There has since been a change. All contracts concerning the MRT Downtown Extension are now referred to as the MRT Downtown LINE PHASE 1. This is reminicent of the former MRT Marina Line (which has since become Phase 1 of the MRT Circle Line). So speculation that the MRT Downtown Extension was part of the Circle Line is indeed proving to be pure speculation as its now part of its own line. Though not officially announced, this change in name when awarding contracts does prove that LTA has since firmed up its plans for the DTE, now DTL.
On a side note, another fact to ponder over is that
1. Earlier contracts have asked for contractors to be prepared for constructing a shell box for Marina Bay Station Interchange
2. Tunnels fron Bayfront to Promenade are stacked twin tunnels = 4 tunnels
3. Overrun tunnels from Bayfront towards Marina Bay Station
So it does APPEAR that there will be tracks leading from Marina Bay Station to Bayfront and on to Promenade. And this could be the Circle Line Stage 6 we are thinking about. After all, what other line seems conveniently placed to connect to Marina Bay Station, and continue on with this possible Marina Bay-Bayfront-Promenade mini line?
LTA is one confusing authority.