I'd wait. About the only reason to book this far ahead is to grab a currently available MFU or what ever it's new name is - to a premium class cabin as these can be harder to obtain as time goes on.
We've done advance booking to get MFU into a higher class cabin and have routinely found the base cabin fare lower due to various sales closer to the travel date (although sometimes the upgrade with miles/avios is not later on).
If you plan to pay for WT and stay in WT wait. Other than a potential increase in fuel charges you are almost sure to get a lower fare with a sale