(Just a short line on where you work, what you do.)
Very short background. (For this it is most important I think, to think about which part, which stake holder in digital textual scholarship you are representing or associating with. For this pitch you should regard yourself as the 'ambassador' for that particular field, domain, institutional part etc. of the wider textual scholarship arena.)
This is the meat: try to express what you think interoperability means to us. What is its use. Is it useful? How should we achieve it? You may purposely be provocative.