Unfortunately, The Mathworks is not in the habit of releasing mexopts files for older MATLAB releases when new compilers come on the market. It would be good if they did, IMO. So what to do? Here are some choices:
1) Look on the FEX for configuration files. Often users create their own mexopts files for specific compilers and platforms and then post them. E.g., I haven't tried these myself but you might take a look here:
2) Modify some older mexopts files that you do have (e.g., 2008) to work with 2010. Sometimes all you need to do is copy the old files into new named files, and then edit the new files and replace version numbers.
3) Find someone with a later version of MATLAB that has 2010 support and get them to compare the 2010 files with the 2008 files so they can tell you precisely what changes to make.