Welcome smile! So, do you think that you're going to wait to hear on admission to the gifted pre-K before you decide on homeschooling? Either way, I don't know that I'd be hugely concerned about a formal curriculum for pre-K. Once you get to K or so, depending on your homeschooling philosophy, you may wind up getting more formal about it assuming you are thinking of homeschooling longer term.

You might want to take a look at some of the lesson plans on the Mensa for Kids website: http://mensaforkids.org/school_template.cfm?showPage=educational_activity_plans.cfm

and the homeschooling tips on the Davidson site: http://www.davidsongifted.org/db/Articles_id_10453.aspx

There are a lot of resources out there for homeschooling and a lot depends on how relaxed you want to be about it and whether you want to buy curriculum or start with the free stuff online. There is a lot of free stuff!