This study investigates public expectations regarding the likelihood and timing of major artificial intelligence (AI) developments among Swedes. Through a mixed-mode survey (web/paper) of 1,026 respondents, we examined expectations across six key scenarios: medical breakthroughs, mass unemployment, democratic deterioration, living standard improvements, artificial general intelligence (AGI), and uncontrollable superintelligent AI. Findings reveal strong consensus on AI-driven medical breakthroughs (82.6%), while expectations for other major developments are significantly lower, ranging from 40.9% for mass unemployment down to 28.4% for AGI. Timeline expectations varied significantly, with major medical advances anticipated within 6-10 years, while more transformative developments like AGI were projected beyond 20 years. Latent class analysis identified three distinct groups: optimists (46.7%), ambivalents (42.2%), and skeptics (11.2%). The optimist group showed higher levels of self-rated AI knowledge and education, while gender differences were also observed across classes. The study addresses a critical gap in understanding temporal expectations of AI development among the general public, offering insights for policymakers and stakeholders.