UPDATE : Group members include

Belgium: Lijst Dedecker (LDD), with 1 MEP in the New Group
Czech Republic: Civic Democratic Party (ODS), with 9 MEPs
Finland: The Centre Party (Keskusta) sits in the Liberal (ALDE) group but one of its MEPs is now joining the New Group.
Hungary: Hungarian Democratic Forum (MDF) with 1 MEP
Latvia: Latvian National Independence Movement (TB/LNNK) with 1 MEP
The Netherlands: ChristianUnion (ChristenUnie) with 1 MEP
Poland: Law & Justice (PiS) with 15 MEPs
United Kingdom: The Conservative Party, with 26 MEPs in the New Group.

They have issued a group declaration:

THE PRAGUE DECLARATION OF PRINCIPLES OF THE EUROPEAN CONSERVATIVES AND REFORMISTS GROUP IN THE EUROPEAN PARLIAMENT

CONSCIOUS OF THE URGENT NEED TO REFORM THE EU ON THE BASIS OF EUROREALISM, OPENNESS, ACCOUNTABILITY AND DEMOCRACY, IN A WAY THAT RESPECTS THE SOVEREIGNTY OF OUR NATIONS AND CONCENTRATES ON ECONOMIC RECOVERY, GROWTH AND COMPETITIVENESS, THE EUROPEAN CONSERVATIVES AND REFORMISTS GROUP SHARES THE
FOLLOWING PRINCIPLES:

1. Free enterprise, free and fair trade and competition, minimal regulation, lower taxation, and small government as the ultimate catalysts for individual freedom and personal and national prosperity.
2. Freedom of the individual, more personal responsibility and greater democratic accountability.
3. Sustainable, clean energy supply with an emphasis on energy security.
4. The importance of the family as the bedrock of society.
5. The sovereign integrity of the nation state, opposition to EU federalism and a renewed respect for true subsidiarity.
6. The overriding value of the transatlantic security relationship in a revitalised NATO, and support for young democracies across Europe.
7. Effectively controlled immigration and an end to abuse of asylum procedures
8. Efficient and modern public services and sensitivity to the needs of both rural and urban communities.
9. An end to waste and excessive bureaucracy and a commitment to greater transparency and probity in the EU institutions and use of EU funds.
10. Respect and equitable treatment for all EU countries, new and old, large and small.