I have received a reply from B & O, unfortunately not as desired!

I think it's a shame that the remote app is not updated, it would have been a small problem to fix the iOS 12 bug!

The answer:
"Hi Erich! We are sorry for the inconvenience. We reviewed this internally and the BeoRemote app is no longer maintained as it has been replaced by the Bang & Olufsen app. Adding your TV to the Bang & Olufsen app will give you similar control features as in the BeoRemote app. Please install it and try it out." 

Hi folks. I had a similar response to boxsti. Unfortunately the new B&O app using ios12 on iphone or iPad freezes when I try to change to any of the 3 screens for tv control of my BV 11-hardly a usable replacement for the brilliant old remote app. And to echo another’s comments where is the control of sound modes which I found particularly useful? Struer needs to address both of the above problems quickly please.

Also had an identical response yesterday evening :( 

Definitely altist, Sound modes, speaker group, join and picture on/off all used lots by us on the 'old' remote app, the TV control in the 'new' app pales in comparison, in terms of easy access to these functions, and even just accessing the TV remote control adds additional (and unnecessary) steps. 

My only guess is that if it wasn't developed in house, it wont be easy for them to fix. That being said, the remote is still available to download in iOS App Store...

I wrote B & O that I can not work with the new app because many features are missing!

Your answer:

"Hi Erich. We are very sorry for this, but we are also very excited to tell you that the App is getting a huge overhaul right now and most of your beloved BeoRemote App functions will be included in the newly reissued App very soon! We still do not know when precisely we can expect this huge update, but it should be very soon! Gr B&O Support" 

Any news as to when we may expect a new version of the Beoremote app that works with iOS 12 or an update of the B&O app that includes all (and hopefully even more) features of the old Beoremote app.

It is quite frustrating to see that they do not update the Beoremote app (which worked rather well and had interesting features) but seem to replace it by a general app that does not even come close to the features of the Beoremote app. At B&O they seem to forget that their customers are buying (hopefully) premium products at a premium price and would like to be able to use them for several years, including the functionalities and features offered by the Beoremote app that was promoted when I purchased my TV (Avant 55 combined with Beolab 20 speakers). It is not as if you (or at least not me) replace a +8k EUR TV every year.

This is the second app frustration I have with my Avant 55.... The first one being the disappearance of the Deezer (and Spotify) apps on the Avant. The fact that the Avant had the Deezer app as a built inn, easy to access (just a push of a preset button), feature was one of the reasons for me to buy the Avant. After months of frustration because the app did not work/load as it should (often crashing or only loading after several attempts)  they apparently stopped updating the app and deleted the app from the Avant ; apparently there is a new version available on the next generation Avant but that dos not really help owners of the previous Avant which is only a few years old....  Sure there are workarounds (streaming your Deezer app from your iPhone to an AppleTV connected to my Avant) but the whole purpose was to have an easy to use one box solution....