Based on further analysis, these stations are likely to be at these locations featuring connectivity to the following lines:
1) Choa Chua Kang - North South Line (NSL) and Bukit Panjang LRT
2) Boon Lay - East West Line (EWL)
3) Jurong East - NSL & EWL
4) Cross Island Line (CRL) station in Jurong Industrial Estate
5) CRL station at West Coast
In addition to these 5 stations, there will probably be other station that connect to future MRT lines. One such potential line may be a line following along Holland Road.