UPC isnt changing its network in Ireland, its only upgrading to DOCSIS 3.0 across its existing footprint. UPC has had issues with its network coverage for many years, even when it was owned by NTL there were service black spots and built but "unlit" areas.
What UPC is doing though is starting to trial a FTTH service like most cable providers around Europe, but the move from an HFC to a pure Fibre network is unlikely in the near future with the recent developments in DOCSIS 3.0, including successful upstream channel bonding from Motorola and Cisco.
UPC is going to run this newer "Fibre Deep" product to new build expansion areas but it wont offer different products as the network transmission will still be DOCSIS 3.0. This is already what happens in Holland where UPC also has a major cable subsiduary which uses a mix of HFC and FTTH and all offering the same products.
I have a friend working for the contractors in Cork and even in their new build areas UPC are still rolling out HFC, so I wouldn't always believe what you read in the media!