I would, however, suggest that you try to indicate on your website a rough estimate when MyHeritage users can link up with your website. As I mentioned before, I expected "coming soon" to suggest that this feature will be available within weeks or months. Over a year is not quite how I would indicate "Coming Soon"!
May I recommend "We are working to enabling our site to link up with MyHeritage - Stay tuned!". I would also suggest that you create a "please let me know when this feature is enabled" link so that interested MyHeritage users can give their email addresses to you to notify them when available. I believe that you will receive a lot of subscriptions as soon as they (MyHeritage customers) know that they can connect with their trees to your site.