In the terms and conditions of Disneyland Hotel it does state:
HOTEL ACCESS
1.1. Access Control: For safety reasons and to preserve the quality of the experience for hotel guests, access to the Disneyland Hotel is strictly reserved to:
• Guests staying at the hotel;
• Individuals with a confirmed reservation for a specific service (restaurants, Spa, “My Royal Dream,” seminar room, etc.).
It's unclear if this is just Disneyland Paris preparing for a busy Christmas season to keep the experience more exclusive for the guests staying at Disneyland Hotel (which is not cheap, but a beautiful stay as we share in our Disneyland Hotel Review) or whether they've had feedback and complaints about the public areas being too busy. If you want to have a look around there's no harm in trying to go in because as there's been no formal announcement, there might be quiet time periods they will let non-hotel guests inside.
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