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It's described in the link above
It's just saying "making it even easier for developers". Generic.
Is the added benefit the fact that you provide bindings for all major languages?
Or does it go beyond that?
Can I already receive an API key and play with Breez+Spark today?
It says more than that. Bindings, LNURL, Lightning addresses etc. It's a private beta for selected partners atm. You can email us or fill out the form if your interested.
It's described in the link above