I'm thinking about the Qtum wallet itself, you can grab the source and compile it now. Does that require the Metropolis update? I was under the impression that the network was live as the mainnet source has been released, I guess if we are before fork and coins have not been swapped for Tokens then the Metropolis update if required can be added safely. There's also the Bitcoin exploit that has to be patched for, the joys of combining two codebases is double the work keeping up with updates and bug fixes.