Tesla shares gained 0.5% premarket after unveiling Megapack 3 and Megablock at its 'Las Megas' event in Las Vegas. Megablock promises 23% faster installs, 40% lower costs, and power for 400,000 homes in 20 days. Production begins at Tesla's Houston Megafactory in 2026. Retail sentiment on Stocktwits was 'neutral' amid high chatter. Tesla stocks has declined 14% YTD.