With around 40 seats left to call results, the UK looks to be heading towards a hung parliament. Currently, there is an almost even split between the Conservatives and a Labour-Liberal Pact. Even if Labour and the Liberal Democrats did form a coalition, they might still not form an outright majority. The delicate balance now forming could hand much greater power to the DUP, Scottish Nationalists and even to the first Green MP, who was elected in Brighton.
In addition to the announced uncertainty, there could also be a number of legal challenges after voters were turned away from polling booths due to lack of capacity. There have already been several recounts. The picture will become clearer within a few days, though the leaders of the major parties may move to make an agreement much sooner.