The rumours can be found
here
the Agency proposes a competency-based instrument rating (CB IR) and an en route instrument rating (EIR) for private (PPL(A)) and commercial pilot (CPL(A)) licence holders.
To instruct for an IR one must either be a FI with Instrument instruction privilegres or an IRI, either to hold at least the rating for which instruction is to be given. Examining requires an IRE.
and what would happen to the UK IRR(A).
Why would anything happent to it? Its not an EASA rating. It has been extended for a further 5 years to 2019 and hopefully will continue beyond that.