parece ser que si por fin lo sacan para 4/3 estará disponible a final de verano, os adjunto el e-mail que me contestaron:
Thank you for your interest in Sigma products. The 70-200 will be fully compatible with the 4/3’s system.
It is expected to be released late summer time.
Best Regards,
Desiree Gaige
Customer Service/Technical Support
SIGMA CORPORATION OF AMERICA