Voltron measures over 15" (40cm) high, 5" (14cm) long and 8" (21cm) wide.
Your best bet is to visit this link at at midnight EST on August 1st and give it a go. We're not sure if the versions sold at SDCC will include any special branding, but the bottom line is that the odds of scoring one of these during the show in July are very, very low. If you'll be attending San Diego Comic-Con, you might be able to bring it home even earlier as limited quantities will be available for attendees to purchase at the show. The general public will be able to bring the 2321-piece LEGO Ideas Voltron set starting on August 1st for $179.99 - which is actually a pretty fair price for a set of this caliber. LEGO gave it the green light in August of 2017. It's been over two years since the fan-designed Voltron set based on the beloved '80s animated series first went up for voting on LEGO Ideas, where it quickly earned the 10,000 votes necessary for official production consideration.