It must be taken into account that though Bruce Wayne went bankrupt in ‘The Dark Knight Rises’, his company remained functional (with a new board of course). And obviously Lucius will remain the CEO as derived from his last scene in which he talks to two technicians about the software patch for ‘the Bat’.
And as for possible future gadgets for Blake, thatz a long way off (as Blake has to train first and get accustomed to all Batman’s existing gadgets, and fighting). But since he knows that all Batman gadgets are from Bruce's company, he will not hesitate to ask for help from Lucius. And when the need arises,I am pretty sure that Fox won't hesitate to help Gotham's new superhero!