I wouldnt hold on to the 12 mth deadline it is only indicative. This is what the EU's code of best practice says
Indicative time frame and outcome of the investigation of a formal complaint
71.
The Commission services endeavour to investigate a formal complaint within a non-binding time limit of 12 months from when they are registered. The investigation could be longer based on the circumstances of the case, for example if the Commission services need to ask the complainant, Member State or third parties for further information.
72.
If a complaint is unsubstantiated, the Commission services will try to inform the complainant within 2 months from its registration that there are insufficient grounds for taking a view on the case. They will invite the complainant to submit further substantive comments within 1 month. If the complainant does not provide further comments within the deadline, the complaint will be considered to have been withdrawn.
73.
With regard to complaints on approved aid and/or aid measures which do not need to be notified, the Commission services will also try to reply to the complainant within 2 months from receipt of the complaint.
74.
Depending on its workload and in applying its right to set the priorities for investigations (50), the Commission services will try to carry out one of the following within 12 months following the registration of the complaint:
—
adopt a decision (51), and send a copy to the complainant;
—
send a letter to the complainant setting out its preliminary views on the measure based on the available information (‘preliminary assessment letter’); this letter is not an official position of the Commission.
75.
If the preliminary assessment letter provisionally concludes that there is no incompatible aid, the complainant can comment on it within 1 month. If the complainant does not comment within the deadline, the complaint will be considered to have been withdrawn.
76.
If a complaint concerns unlawful aid, the Commission services will remind the complainant that it is possible to start proceedings before national courts which can order that such aid be suspended or recovered (52). The Commission services may treat formal complaints on aid measures which are being challenged before national courts as a low priority for the duration of those proceedings.
77.
The Commission services will usually, but not necessarily, forward the non-confidential version of the substantiated complaints to the Member State for comments. The Commission services will invite the Member State concerned to meet the deadlines for commenting and providing information on complaints. Complaints will normally be sent to the Member State in their original language. Nevertheless, the Commission services will provide a translation if the Member State asks for it. This may result in the procedure taking longer.
78.
The Commission services will systematically keep Member States and complainants informed of the processing or closure of complaints.
Also going to depend on how the EU prioritise workload, i would think that this case is not at the forefront of that list. Even after all that there is a right to appeal for all parties involved, so personally i dont see this settled any time soon