The motorway is well ahead of schedule, although I'm not sure when it will actually open. Remember though that you will end up with a huge bill for tolls if you are travelling Kilbeggan-Dublin everyday. The M4 Kilcock-Kinnegad will cost €2.60 each way from January, I don't know where the next toll booths will be, but I'm guessing you will probably have another €2.60 or more to pay for Kinnegad-Kilbeggan. That's over a tenner a day in tolls alone. Or over €2,500 a year, then there's fuel, sevicing, depreciation etc. Just remember to factor all that into your household budget when you are trying to figure out if it really viable to live in Kilbeggan!
BTW not much in the way of supermarkets in Kilbeggan.