RhoConnect Guide gives some conflicting advice about updating RhoConnect.

Rhomobile | Installing RhoConnect

Upgrading from RhoConnect version 4.x is quite simple. All that is needed is to update the version of RhoConnect in your RC app’s gemfile.Then, in the next section:

Rhomobile | Migrating your application to RhoConnect 5.0
The best way of migrating your old RhoConnect app to Rhoconnect 5.0+ is to re-generate the application skeleton using Rhoconnect, then integrate all of your implementation specifics into it. However, if you prefer to migrate your RhoConnect app manually, perform the steps in this document.So, which is it?

It looks to me as if the second advice may be more applicable to a move from 3.5, since that is the example given.

Can others who have updated comment on any particular problems or concerns?

Also, are there some release notes on RhoConnect, so I can see what has been done from 4.1 to 5.1.1 (which is the upgrade I'd like to do).
(Since in the case of RhoConnect server, we have no git repo to follow).