I don't doubt that if "the price is right" BA would buy a small fleet of A380s. There are a handful of routes that have (or potentially have) high volume and/or are restricted by aircraft slots or night bans. Jo'burg, Hong Kong, Sydney and India come to mind straight away. I think Airbus will provide some very keen pricing/deals because if BA gets it, many others will automatically follow suit. (Whatever you might think of BA, this is true.)
We'll find out for sure in a couple of weeks...