Great news (mostly) with the implementation of Google Maps imagery layer into the WME. However, many areas which are covered in higher resolution aerial imagery tend to be quite a few years out of date, but in Google Earth, there is newer lower resolution satellite imagery accessible via the timeline feature, some of it only being months old! It would be great to have a way of accessing these images in WME to help improve the editing process and to keep the Waze database as up to date as possible. Thanks.
I would also love this feature due to the fact in the UK it only shows 2008 imagery but on Google earth there is hi-res 2012 but can also only be viewed by the timeline like you say 
I’m afraid this is unlikely to happen and it’s to do with image licensing.
The images that appear in Google Maps, Google Earth, Bing etc come from many different sources and are supplied under many different licences. In at least one case I have encountered, both Bing and Google Maps have the same aerial image - which obviously comes from a third party.
The images used in Google Maps which are also used in WME, are probably the latest ones for which a suitably relaxed licence is available. The newer images that you can see in Google Earth are probably under more restrictive or expensive licences - since Google Earth is not used all over the Internet, I am guessing that Google has been able to pay less for licensing those images.
Although Google may have bought Waze, it is still run as a separate company. Of course it makes more sense for the Waze part of the Google family to be paying another part of the Google family for imagery rather than a competitor - but Waze are undoubtedly still paying for those images.
Remember that you can only directly use the Google imagery provided in WME. Tracing details from other images on Google Earth (or other providers) is definitely not allowed. However, the Google Earth timeline feature can still be used to “check facts”. This works particularly well when you have reports that a junction has changed and you are unsure about the WME image. You can sometimes use the timeline feature to go back in time and work out whether the image you’re seeing is of a junction that has been there for a long time or has recently been changed.