For those planning to upgrade their S2's . Do you think Bitmain will provide the below parts to use the old hashing boards instead of having them sit on a shelf ?
Would be nice, if they could sell the following only:
1 Power Board;
1 set of IO Board + BB Board + SD card;
2 sets of Fans + Fans cover;
1 LCD screen;
Try thinking out of the box? Keep your S2 intact and buy two S3's

magic!
You can think like that when you have access to unlimited power. For those that would like to put as much hashing power as possible on the same outlet, especially if no PSU upgrade is required. It is best to do the upgrade and resell the old hashing boards. That way you increase your hashing power while keeping the power requirements constant.
magic lol
If you took a little more time reading the quote that I was replying too
"Do you think Bitmain will provide the below parts to use the old hashing boards instead of having them sit on a shelf ?"
The OP wanted to reuse the old hashing boards thus why not keep his S2 intact as is. Pointless to take the boards out of the original box to stick them in another.
Do you own a S2 to begin with ?
If someone will only be purchasing the new hashing cards, going off what was communicated about the S2 being upgradable. They will not be buying a complete S4* with all the bells and whistles. All that choose to upgrade their S2's will have to remove the old hashing cards to replace it with the new ones.
Therefore since a new and complete S4* was not purchased with the bells and whistles, but ONLY the hashing cards. The old hashing cards that were removed from the S2 will not be used. But if only the specific parts below can be provided, which should be very cheap. Then for those that choose to upgrade instead of buying a new S4* with PSU, case etc. Will be able to use the old hashing boards without paying too much.
1 Power Board;
1 set of IO Board + BB Board + SD card;
2 sets of Fans + Fans cover;
1 LCD screen;
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*- Used S4 since S3 is being used as the upgrade name for S1 if i remember correctly