I had a quick look at the versions for each platform (
https://stardewcommunitywiki.com/Stardew_Valley_Wiki ) and I can't see where they should be "far behind". You have to understand how the process of updates works on mobile / console platforms. Usually it is a combination of prolonged verification and depending on platform may cost even money. As you can see, there are some bugs and balancing issues on the current 1.5 version so it is far easier to fix it on PC first and then give it to the consoles / mobile instead of constantly patching / hotfixing several of them. CA already stated the update comes in Q1 to the consoles. Just relax, it is only 2/3 of a month out yet.