I founded four companies, and have always made them 'transparent' to prospective employees. In fact, I show them a projected cap table that tells them what they can expect -- 2 more financings to liquidity, the opportunity to pick up an another ~30k options, $10/share exit = $600k and growing -- IF we all work hard and pull together. If they're not forthcoming with you at this point, they won't be down the line.