Hall of Monuments (GW2)  

How does hall of monuments in the guild wars trillogy effect guild wars 2

The hall of monuments is an instanced area in which you can display your mini pets, Heroes, armour, weapons and achievements. These items pets and achievements have a point system attached, which will earn you rewards for guild wars 2. The rewards can range from starter items and cosmetics too pets. So in short playing the guild wars trilogy will directly affect guild wars 2 within the hall of monuments.

Here is a link to a great points calculator your character has earned [1]

Will I keep my collections and achievements in Guild wars 2

Yes you certainly will. Your collections and achievements once you have linked your account to guild wars 2 will transfer. So make sure you remember your admin login for release so you can link your account.

Guild Wars 2 Wikibase™