That just over a year together is too soon to move in together! Biochemically and psychologically you're still in the "rose coloured glasses" phase. Have you even had a long holiday together yet?
Aside from that:
MONEY -
how are you going to split everyday costs?
How are you going to save for emergencies/long term goals?
What if one or both of you loses your job or becomes too ill to work?
What are your current spending habits? Is either or both a spendthrift/gambler/risk taker?
Do you both consider the same things essentials/luxuries?
If you're planning to have DC how will those costs and income changes be covered?
Do either/both of you have current debt?
FAMILY/RELATIONSHIPS
Are you going to marry? Do you both agree on the answer to this? If so when?
What do you class as infidelity?
Are you compatible sexually? (I think it's very hard to know this for sure this early on)
Are you going to have DC? Do you both agree on the answer to this? If so when? If you are so you have similar views on parenting (discipline, schooling etc)
Do you get along with each other's families? Friends? If these people offend/hurt your partner what would your response be?
Do you have similar traditions/ways of living? From mealtimes to what you do at Christmas
Do you have similar views on houseguests/visitors?
CHORES
Do you have similar standards of cleanliness?
Are either/both of you tending to the lazy side on this?
Have you both experience of living away from parents and taking responsibility for chores?
Any potential for sexist division of labour from either?
OPINIONS
Do you roughly share the same opinions on politics, religion, economics, prejudices etc?
If you don't completely agree how do you resolve conflict?
DEALBREAKERS
What are your hard boundaries?
What do consider acceptable and unacceptable behaviour in relation to all the above?