Err, I cannot confirm that DLU is “going to happen”, but what I have heard is that it uses proprietary physics (Havok Physics) so the server itself allegedly cannot be released in compiled form or as source code. This means that they will be the only people that can develop or host a DLU server. As for a max player base, I have heard that it will be around 40 if it is “actually going to happen”, and it will be very hard to obtain one of these 40 slots… so I wouldn’t have high hopes for DLU at this point.