If you download the DB app you will find the information there.

Thanks. Had the app and never thought to look there. 

This may change any time, though as such it is even printed-and thus for planned daily all-the-same on the large departure overviews in the Bhf. YELlow=dep, white=arr.

It will be announced in train 1-but orally probably only in german and perhaps also bad english.

It will be shown on screens IN train 1

You can ask conductor when s/he does the rounds before. In fact no that I think of this-on normal tickets it is most often printed too (with ´caution-can change!) so should also be on the paid supplt/RES you need to have for TGV=train2

You will not be the only one to make this change

In most cases it is same platform-other side

Oh-and not to alarm you-its DB, Germany, so expect delays

You can use ANY train IN DE so if this makes you unhappy-use an earlier train from M to MH

From as per tomorrow most trains on this line will start using the then newly taken in use hi-speed sector between Ulm and Stuttgart-airport- we´ll have to wait&see what this will bring- teething troubles-or not.

Thanks both. Both excellent answers and highly informative. Cheers