There are in fact three new security features for the Europa series notes, best described as the FEEL, LOOK and TILT elements to confirm the notes are genuine.
The FEEL aspect is the 'raised printing' (embossing) of the letters ECB, BCE, etc in many languages on either side of the face of each note.
The LOOK aspect is the icon style 'portrait watermark' left of centre of the note face.
The TILT aspect is the change in the Emerald coloured figure "10".
The rest of the Europa series of banknotes will be introduced gradually over several years, in ascending order. The next will be the €20, then €50, €100, €200 and the €500 denominations. Release dates have yet to be announced.
For further more detailed information on the FEEL-LOOK-TILT features, you can check out the dedicated European Central Bank website.